How accurate is 12 week dating scan


24-Jul-2017 20:02

When a foetus has Down syndrome they tend to have more fluid at the base of their neck, in the region known as the nuchal fold area.This fluid can be measured in a test called nuchal translucency.This is specifically to conduct a measurement of pregnancy hormones.If chromosomal abnormalities are present, these results can be out of the normal range.Other tests for Down Syndrome need to be done if in doubt.In addition, blood tests such as a Chorion Villus Sampling test or an amniocentesis help to clarify any suspicions.The 12 week ultrasound may be the first time parents have seen their little baby.

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A mother’s age, including the results from the blood test, and the findings of the ultrasound all provide an individualised picture of her risk of having a baby with Down Syndrome.A foetus with Down Syndrome has a measurement which is thicker than in those who do not.It is worth remembering though, that a larger than average nuchal fold measurement is not a guarantee that the baby will have chromosomal problems.It’s completely normal for parents to consider the possibility that their baby may not be developing as it needs to and perhaps build apprehension before the procedure.



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